Re: why is the sims 4 game being so slow?
@abc1381541026 This size of your Mods folder might not be an issue but if you have any outdated mods in there then yeah something like that could definitely be causing many problems in your game. You might want to temporarily remove all mods and CC from your Mods folder and put them in a safe place like an external drive or a temp folder on your desktop (leave the file called Resource.cfg). Then delete the localthumbcache.package file in your Sims 4 folder (this step is important), and then try a test on a fresh New Game. If all looks good then you can just quit without saving.
If your game works fine without mods and CC, then you should start checking to see which files are causing the problem. The best way to start your troubleshooting is to check all of your mods to see if any of them have updated versions available that are compatible with the latest game patch. Even if they aren't causing any noticeable problems in your game you should only use updated versions of all mods. I check for updates after every game patch. Here is one mod tracker site I use to check for updates:
https://simsonic.weebly.com/modtracker.html
Scroll down to where you see Main Tracker / A - Z and see if you can find your mods in there. The tracker often provides links to where you can download an updated version or it will show if an older version of a mod is still compatible with the latest game patch.
Here is another site you can use to find out which mods and CC have been affected by the latest game patch:
After you have downloaded updated versions of your mods, or verified that your current versions are compatible with the latest game patch, you can start putting them back in. You can try adding your CC first as they are less likely to have been made obsolete by a game patch. If you have a lot of files you can try the 50/50 method where you add half of your CC, then check your game, and if all looks good add the other half and check again. Then do the same with adding updated versions of your mods. If anything looks wrong you'll have to use trial and error to see which file is still causing a problem. If you find something obsolete with no updated versions available you'll just have to stop using it.
I know this is a long answer but there aren't really any short-cuts for maintenance and troubleshooting of mods and CC.
Good luck, I hope this helps :D